<template>
  <div class="msite">
    <!--首页头部-->
    <header-top :title="address.city+''+address.name">
         <span class="header_search" slot="left">
            <i class="iconfont icon-sousuo"></i>
          </span>
      <router-link class="header_login" slot="right" :to="userInfo._id ? '/userinfo': '/login'">
            <span class="header_login_text" v-if="!userInfo._id">
              登录|注册
            </span>
        <span class="header_login_text" v-else>
              <i class="iconfont icon-person"></i>
            </span>
      </router-link>
    </header-top>
    <!--首页导航-->
    <nav class="msite_nav">
      <div class="swiper-container" v-if="categorysArr.length">
        <div class="swiper-wrapper">
          <div class="swiper-slide" v-for="(categorys , index) in categorysArr" :key="index">
            <a href="javascript:" class="link_to_food" v-for="(category,index) in categorys" :key="index">
              <div class="food_container">
                <img :src="baseImageUrl+category.image_url">
              </div>
              <span>{{category.title}}</span>
            </a>
          </div>
        </div>
        <!-- Add Pagination -->
        <div class="swiper-pagination"></div>
      </div>
      <img src="./images/msite_back.svg" v-else>
    </nav>
    <!--首页附近商家-->
    <div class="msite_shop_list">
      <div class="shop_header">
        <i class="iconfont icon-xuanxiang"></i>
        <span class="shop_header_title">附近商家</span>
      </div>
      <shop-list/>
    </div>
  </div>
</template>

<script>
  import HeaderTop from '../../components/HeaderTop/HeaderTop'
  import Swiper from 'swiper'
  import 'swiper/css/swiper.min.css'
  import ShopList from '../../components/ShopList/ShopList'
  import {mapState} from 'vuex'

  export default {
    data () {
      return {
        baseImageUrl: 'https://fuss10.elemecdn.com'
      }
    },
    mounted () {
      this.$store.dispatch('getFoodTypes')
      this.$store.dispatch('getShopsByLatitude')
    },
    computed: {
      ...mapState(['address', 'categorys', 'userInfo']),
      /*
      根据categorys一维数据生产一个二维数组
      因为要分层最大个数为8个
       */
      categorysArr () {
        const {categorys} = this
        const arr = []
        let minArr = []
        categorys.forEach(c => {
          if (minArr.length === 8) {
            minArr = []
          }
          if (minArr.length === 0) {
            arr.push(minArr)
          }
          minArr.push(c)
        })
        return arr
      }
    },
    watch: {
      // 创建一个Swiper实列对象,实现轮播
      /*  category(value){
          setTimeout(new Swiper('.swiper-container', {
              loop: true, // 循环轮播
              // 需要分页器
              pagination: {
                el: '.swiper-pagination',
              },
            }
          ),100)
        }*/
      // 在界面更新就立即创建
      categorys (value) { // 在category有数据有创建轮播图  可以使用setTimeOut但是不推荐
        this.$nextTick(() => {// 一旦界面更新就立即调用
          new Swiper('.swiper-container', {
            loop: true, // 可以循环轮播
            // 分页器
            pagination: {
              el: '.swiper-pagination'
            }
          })
        })
      }
    },
    components: {
      HeaderTop,
      ShopList
    }
  }
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixins.styl"
  .msite //首页
    width 100%

    .header
      background-color #02a774
      position fixed
      z-index 100
      left 0
      top 0
      width 100%
      height 45px

      .header_search
        position absolute
        left 15px
        top 50%
        transform translateY(-50%)
        width 10%
        height 50%

        .icon-sousuo
          font-size 25px
          color #fff

      .header_title
        position absolute
        top 50%
        left 50%
        transform translate(-50%, -50%)
        width 50%
        color #fff
        text-align center

        .header_title_text
          font-size 20px
          color #fff
          display block

      .header_login
        font-size 14px
        color #fff
        position absolute
        right 15px
        top 50%
        transform translateY(-50%)

        .header_login_text
          color #fff

    .msite_nav
      bottom-border-1px(#e4e4e4)
      margin-top 45px
      height 200px
      background #fff

      .swiper-container
        width 100%
        height 100%

        .swiper-wrapper
          width 100%
          height 100%

          .swiper-slide
            display flex
            justify-content center
            align-items flex-start
            flex-wrap wrap

            .link_to_food
              width 25%

              .food_container
                display block
                width 100%
                text-align center
                padding-bottom 10px
                font-size 0

                img
                  display inline-block
                  width 50px
                  height 50px

              span
                display block
                width 100%
                text-align center
                font-size 13px
                color #666

        .swiper-pagination
          > span.swiper-pagination-bullet-active
            background #02a774

    .msite_shop_list
      top-border-1px(#e4e4e4)
      margin-top 10px
      background #fff

      .shop_header
        padding 10px 10px 0

        .shop_icon
          margin-left 5px
          color #999

        .shop_header_title
          color #999
          font-size 14px
          line-height 20px

</style>
